U.S. and Western intelligence agencies were reviewing classified data showing Israel most likely conducted a strike in the Thursday-Friday time frame, according to both officials.
This was during the same time frame that the U.S. collected additional data showing Israel was flying a high number of warplanes over Lebanon.
One official said the United States had limited information so far and could not yet confirm those are the specific warplanes that conducted a strike.
Based on initial indications, the U.S. does not believe Israeli warplanes entered Syrian airspace to conduct the strikes.
Both officials said there is no reason to believe Israel struck at a chemical weapons storage facilities.